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The design of lubricious oil-in-water emulsions

The design of lubricious oil-in-water emulsions
The design of lubricious oil-in-water emulsions
Oil-in-water emulsions, as used in metal working and fire-resistant hydraulic fluids, often show poor lubricating performance and one reason for this is their inability to form effective elastohydrodynamic films. This paper considers how the composition of an oil-in-water emulsion contributes to its lubricating properties.
A key factor in oil-in-water emulsion performance lies in the ability of the dispersed oil droplets to wet polar metal surfaces and thus promote full elastohydrodynamic lubrication, without starvation, up to high speeds. In this paper it is shown how this ability can be quantified in terms of measurable surface chemical parameters. Based on this work, three rules for designing lubricious oil-in-water emulsions are proposed. Where possible (a) the emulsifier concentration used should be just below its critical micelle concentration value, (b) the base oil should be polar and (c) the base oil should be viscous. The first two of these factors will promote oil-phase surface wetting while the third will ensure thick-film formation in the full elastohydrodynamic regime.
1350-6501
195-208
Ratoi, M.
cfeffe10-31ca-4630-8399-232c4bc2beff
Spikes, H.
2ba0fb67-f1fd-4cca-a210-5d62e093dd66
Hoogendoom, R.
7c6e56ef-ed04-4bdf-8a93-d4799cd3b1c6
Ratoi, M.
cfeffe10-31ca-4630-8399-232c4bc2beff
Spikes, H.
2ba0fb67-f1fd-4cca-a210-5d62e093dd66
Hoogendoom, R.
7c6e56ef-ed04-4bdf-8a93-d4799cd3b1c6

Ratoi, M., Spikes, H. and Hoogendoom, R. (1997) The design of lubricious oil-in-water emulsions. Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology, 211 (3), 195-208. (doi:10.1243/1350650971542426).

Record type: Article

Abstract

Oil-in-water emulsions, as used in metal working and fire-resistant hydraulic fluids, often show poor lubricating performance and one reason for this is their inability to form effective elastohydrodynamic films. This paper considers how the composition of an oil-in-water emulsion contributes to its lubricating properties.
A key factor in oil-in-water emulsion performance lies in the ability of the dispersed oil droplets to wet polar metal surfaces and thus promote full elastohydrodynamic lubrication, without starvation, up to high speeds. In this paper it is shown how this ability can be quantified in terms of measurable surface chemical parameters. Based on this work, three rules for designing lubricious oil-in-water emulsions are proposed. Where possible (a) the emulsifier concentration used should be just below its critical micelle concentration value, (b) the base oil should be polar and (c) the base oil should be viscous. The first two of these factors will promote oil-phase surface wetting while the third will ensure thick-film formation in the full elastohydrodynamic regime.

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Published date: 1 March 1997
Organisations: nCATS Group

Identifiers

Local EPrints ID: 356073
URI: http://eprints.soton.ac.uk/id/eprint/356073
ISSN: 1350-6501
PURE UUID: 15f4fa82-5cc9-46f3-a929-c04a30c63c0e
ORCID for M. Ratoi: ORCID iD orcid.org/0000-0001-8400-3054

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Date deposited: 25 Oct 2013 13:52
Last modified: 15 Mar 2024 03:35

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Author: M. Ratoi ORCID iD
Author: H. Spikes
Author: R. Hoogendoom

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